论文标题
无应力转化应变对贝氏体自催化生长的影响：多相现场分析
Influence of stress-free transformation strain on the autocatalytic growth of bainite: A multiphase-field analysis
论文作者
论文摘要
为预测贝氏体转化速率而制定的分析处理将自催化定义为在bainite- austenite界面上亚基的生长。此外，无应力转化应变的作用通常被转化为热力学标准，该标准需要实现亚基的生长。在目前的工作中，使用弹性相位模型优雅地恢复了尖锐的接口关系，用于全面地阐明弹性能对亚基进化的影响。当前分析的主要发现是，特征菌在贝氏体转化中的作用显然是复杂的，可以直接量化为热力学约束。人们意识到，由主要亚基的生长引起的不均匀应力状态为次级亚基的生长带来了空间依赖的不良和受欢迎的条件。基于弹性相互作用，假定了一个偏爱的轮廓，该轮廓包含了促进弹性偏爱生长的部分。通过数值分析，验证了偏好性范围内亚基的增长。当前的调查表明，随着亚基的进行性生长，弹性优选区域的形态和大小分别变化并增加。
Analytical treatments, formulated to predict the rate of the bainite transformation, define autocatalysis as the growth of the subunits at the bainite-austenite interface. Furthermore, the role of the stress-free transformation strain is often translated to a thermodynamic criterion that needs to be fulfilled for the growth of the subunits. In the present work, an elastic phase-field model, which elegantly recovers the sharp-interface relations, is employed to comprehensively explicate the effect of the elastic energy on the evolution of the subunits. The primary finding of the current analysis is that the role of eigenstrains in the bainite transformation is apparently complicated to be directly quantified as the thermodynamic constraint. It is realized that the inhomogeneous stress state, induced by the growth of the primary subunit, renders a spatially dependent ill- and well-favored condition for the growth of the secondary subunits. A favorability contour, which encloses the sections that facilitate the elastically preferred growth, is postulated based on the elastic interaction. Through the numerical analyses, the enhanced growth of the subunits within the favorability-contour is verified. Current investigations show that the morphology and size of the elastically preferred region respectively changes and increases with the progressive growth of the subunits.
